For a period of seven years, Wilfred Thesiger canoed through the marshes at the confluence of Iraq's Tigris and Euphrates rivers, living among the native Madan tribes and their islands made of reeds. Now extinct, their ancient way of life is speculated to have existed for 5,000 years, going back to the days of ancient Sumer, and possessed a unique culture found nowhere else in the Middle East. The...